It looks like it is in the final stages to be used for next year with the added teams all being play in games. I haven't seen any details on what seeds this would include. Personally I think it is stupid for two teams to be ranked 11th but have to "play in" but a 15th seed or 16th doesn't. Seems to me this should be all the lower teams having to do these games but I know those games often get bad TV ratings while the 11 seed gets ok ratings.
https://www.espn.com/mens-college-basketball/story/_/id/48621117/sources-ncaa-basketball-tournaments-set-move-76-teams
https://www.espn.com/mens-college-basketball/story/_/id/48621117/sources-ncaa-basketball-tournaments-set-move-76-teams